Ate about 50 bars and 10kg of Soylent, didn't feel a thing. Five of my family members ate some amount too, and seemed fine. How are they sure people aren't mi

Ate about 50 bars and 10kg of Soylent, didn't feel a thing. Five of my family members ate some amount too, and seemed fine. How are they sure people aren't misattributing this to something else, or just being nocebo about it after the first news reports came? I did have diarrhea a couple of times during last 5 months but why should I attribute it to Soylent? edit: downvoters, if you have any information I don't know, please reply so I don't look like an idiot.